Estimation of Live Weight by Body Measurements in the Miranda Donkey Breed.
Authors: Quaresma Miguel, Bacellar Daniel, Leiva Bélen, Silva Severiano R
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Live Weight Estimation in Miranda Donkeys Accurate weight assessment is fundamental to equine practice, yet practitioners working without scales often rely on weight estimation formulas derived from smaller donkey breeds—a approach that systematically underestimates larger animals. Researchers measured heart girth, body length and height in 65 Miranda breed donkeys (ranging from 4 days to 15.4 years old, mean weight 280.8 kg) to develop breed-specific prediction equations. Heart girth proved the strongest predictor of live weight (r = 0.937), substantially outperforming body length (r = 0.915) and height (r = 0.894), and a quadratic formula incorporating heart girth measurements yielded the most accurate estimations: LW = 98.138 − 3.0386 × HG + 0.0293 × HG². These findings have direct clinical application: the derived equation can be calibrated into breed-specific weight tapes for large-frame European donkey breeds, enabling farriers, veterinarians and handlers to make evidence-based decisions regarding medication dosing, nutritional management and workload assignment without access to weighing scales.
Read the full abstract on PubMed
Practical Takeaways
- •Use heart girth measurement as the most reliable single body measurement for estimating donkey weight when scales are unavailable, particularly for large European breeds
- •Apply the Miranda-specific quadratic formula to accurately calculate live weight for medication dosing and workload assessment in this breed
- •Avoid using weight estimation formulas developed for smaller donkey breeds on large-frame European donkeys, as they systematically underestimate weight
Key Findings
- •Heart girth showed the strongest correlation with live weight (r = 0.937) compared to body length (r = 0.915) and height (r = 0.894) in Miranda donkeys
- •A quadratic formula based on heart girth (LW = 98.138 - 3.0386 × HG + 0.0293 × HG²) accurately estimates live weight in large-frame European donkey breeds
- •Existing weight estimation formulas designed for smaller donkey breeds tend to underestimate live weight in larger frame breeds like the Miranda
- •Miranda breed donkeys studied had mean live weight of 280.8 ± 106.1 kg with ages ranging from 4 days to 15.4 years